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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2096) Secure local filesystem IO from symlink vulnerabilities
Date Sat, 04 Dec 2010 02:20:12 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966780#action_12966780
] 

Todd Lipcon commented on MAPREDUCE-2096:
----------------------------------------

We don't need it absolutely immediately, except that it's very tough to verify this change
even manually in the current state of the project :(

I've got the patch forward ported but still need to fix up one or two things and run through
the non-secure unit tests. I should post a final version this weekend.

> Secure local filesystem IO from symlink vulnerabilities
> -------------------------------------------------------
>
>                 Key: MAPREDUCE-2096
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2096
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker, security, tasktracker
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Blocker
>         Attachments: mapreduce-2096-index-oob.txt, secure-files-9.txt, secure-files-authorized-jvm-fix.txt
>
>
> This JIRA is to contribute a patch developed on the private security@ mailing list.
> The vulnerability is that MR daemons occasionally open files that are located in a path
where the user has write access. A malicious user may place a symlink in place of the expected
file in order to cause the daemon to instead read another file on the system -- one which
the attacker may not naturally be able to access. This includes delegation tokens belong to
other users, log files, keytabs, etc.

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